Ultrasensitive enzyme-free fluorescent detection of VEGF₁₆₅ based on target-triggered hybridization chain reaction amplification.

ABSTRACT: Sensitive detection of vascular endothelial growth factor (VEGF₁₆₅) is important for early cancer disease diagnosis in the clinic. A sensitive fluorescent sensing platform for VEGF₁₆₅ detection is developed in this work. It is based on a target-triggered hybridization chain reaction (HCR) and graphene oxide (GO) selective fluorescence quenching. In this assay, in the presence of the VEGF₁₆₅, the hairpin structure of Hp opens up and the initiation sequence will be exposed to Hp1 to open its hairpin structure. Then the opened Hp1 hybridizes with Hp2 to expose the complementary sequence of Hp1 which hybridizes with Hp1 again by HCR. Thus HCR would be initiated, generating super-long dsDNA. After the HCR, the double strands of the HCR product cannot be adsorbed

SUBMITTER: Zhou Q 

PROVIDER: S-EPMC9086580 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature